Baldwin | Contemporary Double Cylinder Deadbolt for 1-5/8" Bore Hole in Lifetime Polished Nickel. Model # 8011055. Double Cylinder locks are keyed on both sides of the door and are only locked and unlocked via a key. Solid forged brass. Low profile cylinder deadbolt for 1.625" door prep. Features 0.5" low profile cylinder projection. Deadbolt case is formed of heavy gauged steel for strength;; most interior parts are made of solid brass. Accommodates 1.75" thick door and 1.625" diameter cut outs.